-ic a-a a-b a-c a-i aaa aab aac aae aai aak aas aau ab- aba abb abc abe abi abk abs abu ac- aca acb acc ace aci ack acs acu aea aeb aec aee aei aek aes aeu ai- aia aib aic aie aii aik ais aiu aka akb akc ake aki akk aks aku as- asa asb asc ase asi ask ass asu au- aua aub auc aue aui auk aus b-u baa bab bac bae bai bak bas bau bba bbb bbc bbe bbi bbk bbs bbu bca bcb bcc bce bci bck bcs bcu be- bea beb bec bee bei bek bes beu bi- bia bib bic bie bii bik bis biu bka bkb bkc bke bkk bks bsa bsb bsc bse bsi bsk bss bsu bua bub buc bue bui buk bus buu c-- caa cab cac cae cai cak cas cau cba cbb cbc cbe cbi cbk cbs cbu cca ccb ccc cce cci cck ccs ccu ce- cea ceb cec cee cei cek ces ceu ci- cia cib cic cie cii cik cis ciu cka ckb ckc cki cks csa csb csc cse csi csk css csu cua cub cuc cue cui cuk cus cuu eaa eab eac eae eai eak eas eau eba ebb ebc ebe ebi ebk ebs ebu ec- eca ecb ecc ece eci eck ecs ecu eea eeb eec eee eek ees eia eib eic eie eii eik eis eiu eka ekb ekc eke eki eks eku es- esa esb esc ese esi esk ess esu eu- eua eub euc eue eui eus ia- iaa iab iac iae iai ias iau iba ibb ibc ibe ibi ibk ibs ibu ica icb icc ice ici ick ics icu ie- iea iec iee iei iek ies iia iib iic iie iii iis iiu ika ikb ikc ike iki ikk iks iku is- isa isb isc ise isi isk iss isu iu- iua iub iuc iue iui ius ka- kaa kab kac kae kai kak kas kau kba kbb kbc kbe kbi kbk kbs kbu kca kcb kcc kce kci kck kcs kcu ke- kea keb kec kee kei kek kes kia kib kic kie kii kik kis kiu kkb kkc kke kki kkk kks kku ksa ksb ksc kse ksi ksk kss ksu kub kuc kue kui kuk kus kuu saa sab sac sae sai sak sas sau sba sbb sbc sbe sbi sbk sbs sbu sca scb scc sce sci sck scs scu se- sea seb sec see sei sek ses seu sia sib sic sie sii sik sis siu sk- ska skb skc ske ski skk sks sku ss- ssa ssb ssc sse ssi ssk sss ssu sua sub suc sue sui suk sus suu ua- uaa uab uac uae uai uak uas uau uba ubb ubc ube ubi ubk ubs ubu uca ucb ucc uce uci uck ucs ucu uea ueb uec uee uei ues uia uib uic uie uii uis uiu uka ukb ukc uke uki ukk uku usa usb usc use usi usk uss usu uua uuc uue uus uuu